Hi Ron,
Here is the owners manual 2011 gmc 2500 4x4
From what I can find I would say yes it is towable, Most are according to GM. Below you will find the owners manual attached.
Sean
[PDF]http://www.gmc.com/content/dam/GMC/global/master/nscwebsite/en/home/Owners/Manuals/01_Images/2012-sierra-manual.pdf[/PDF]
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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